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Copper-based low-temperature reversible thermochromic material and preparation method thereof

A thermochromic material and low temperature technology, applied in the field of materials, can solve the problems of irreversible discoloration process and high discoloration temperature, and achieve the effects of simple and mature preparation method, low discoloration temperature and short discoloration time

Inactive Publication Date: 2017-07-14
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Researchers have prepared a series of MOFs-based thermochromic materials. The discoloration process is mainly due to the change of the coordination environment of the metal center when heated. However, the discoloration temperature of some MOFs-based thermochromic materials is high, and the discoloration process is irreversible. Therefore, its further application is limited
In addition, MOFs are basically powder materials, and there are few reports of MOFs ordered materials.

Method used

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  • Copper-based low-temperature reversible thermochromic material and preparation method thereof
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  • Copper-based low-temperature reversible thermochromic material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0031] Cu(OH) 2 The preparation method of the nanowire array includes the following steps:

[0032] (1) The Cu sheet with a purity greater than 99.9% and the Ti sheet with a purity greater than 99.7% were ultrasonicated in acetone, absolute ethanol and deionized water for 10 minutes respectively to remove oil stains and oxides on the surface, and dried in an oven for use;

[0033] (2) The high-purity Cu sheet after cleaning and drying was used as the anode, the high-purity Ti sheet after cleaning and drying was used as the cathode, and the anodic oxidation reaction was performed in a 2mol / LKOH aqueous solution for 10 minutes, and the current density was 2.5mA / cm 2 , the reaction temperature is 10 °C to obtain Cu(OH) 2 array of nanowires.

Embodiment 2

[0035] A preparation method of a copper-based low-temperature reversible thermochromic material, comprising the following steps:

[0036] (1) The Cu sheet with a purity greater than 99.9% and the Ti sheet with a purity greater than 99.7% were ultrasonicated in acetone, absolute ethanol and deionized water for 10 minutes respectively to remove oil stains and oxides on the surface, and dried in an oven for use;

[0037] (2) The high-purity Cu sheet after cleaning and drying was used as the anode, the high-purity Ti sheet after cleaning and drying was used as the cathode, and the anodic oxidation reaction was performed in a 2mol / LKOH aqueous solution for 10 minutes, and the current density was 2.5mA / cm 2 , the reaction temperature is 10 °C to obtain Cu(OH) 2 array of nanowires;

[0038] (3) Cu(OH) obtained in step (2) 2 The nanowire array was placed in 50 mmol / L 1,3,5-benzenetricarboxylic acid in anhydrous ethanol solution, soaked for 5 min, the reaction temperature was 25 °C, ...

Embodiment 3

[0040] A preparation method of a copper-based low-temperature reversible thermochromic material, comprising the following steps:

[0041] (1) The Cu sheet with a purity greater than 99.9% and the Ti sheet with a purity greater than 99.7% were ultrasonicated in acetone, absolute ethanol and deionized water for 10 minutes respectively to remove oil stains and oxides on the surface, and dried in an oven for use;

[0042] (2) The high-purity Cu sheet after cleaning and drying was used as the anode, the high-purity Ti sheet after cleaning and drying was used as the cathode, and the anodic oxidation reaction was performed in a 2mol / LKOH aqueous solution for 10 minutes, and the current density was 2.5mA / cm 2 , the reaction temperature is 10 °C to obtain Cu(OH) 2 array of nanowires;

[0043] (3) Cu(OH) obtained in step (2) 2 The nanowire array was placed in 50 mmol / L 1,3,5-benzenetricarboxylic acid in anhydrous ethanol solution, soaked for 10 min, the reaction temperature was 25 °C,...

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Abstract

The invention discloses a copper-based low-temperature reversible thermochromic material which is a Cu(OH)2 / HKUST-1 composite material and is low in color changing temperature, short in color changing time and short in time recovering time. A preparation method of the copper-based low-temperature reversible thermochromic material comprises the following steps: cleaning and drying a high-purity Cu sheet and a high-purity Ti sheet; preparing a Cu(OH)2 nanowire array by taking the cleaned and dried high-purity Cu sheet as an anode, taking the cleaned and dried high-purity Ti sheet as a cathode and using an anodic oxidation method; soaking the Cu(OH)2 nanowire array into an absolute ethyl alcohol solution of 1,3,5-benzenetricarboxylic acid, cleaning the Cu(OH)2 nanowire array by using deionized water, and drying the Cu(OH)2 nanowire array to obtain the low-temperature reversible thermochromic material of Cu(OH)2 / HKUST-1. The preparation method of the copper-based low-temperature reversible thermochromic material, disclosed by the invention, is simple and mature, low in cost, high in color changing contrast, low in color changing temperature, short in color changing time and color recovering time and high in reversibility.

Description

technical field [0001] The invention relates to a copper-based low-temperature reversible thermochromic material and a preparation method thereof, belonging to the technical field of materials. Background technique [0002] The phenomenon that some mixtures or compounds change color when the temperature changes is called thermochromic, and the substances with this phenomenon are thermochromic materials. In recent years, thermochromic materials based on inorganic, organic, liquid crystals, polymers, and biological macromolecules have attracted more and more attention, and are widely used in various fields such as national defense, military, anti-counterfeiting marks, and daily decoration, such as Daily electrical appliances overheating alarm, mechanical device temperature distribution measurement, etc. The discoloration process of thermochromic materials is a process of thermophysical or thermochemical changes, mainly including crystal transformation, gain and loss of crysta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C25D11/34C25D7/00C09K9/00
CPCC01P2002/72C09K9/00C23C18/54C23F17/00C25D7/006C25D11/34
Inventor 吴玉程余翠平崔接武王岩张勇舒霞
Owner HEFEI UNIV OF TECH
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